Question

Which from following tests decides the straight chain structure of glucose?

Options

• Glucose forms oxime when treated with hydroxylamine.

• Glucose forms cyanohydrin when treated with HCN.

• Glucose forms gluconic acid when treated with Br₂ water.

• Glucose forms n-hexane when prolong heated with HI.

Answer 1

Glucose forms n-hexane when prolong heated with HI.

Explanation:

The six carbons in glucose molecule form a straight chain was inferred from the following observation:

Glucose gives n-hexane on prolonged heating with HI.

\[CHO(CHOH)_4CH_2OH\longrightarrow CH_3-(CH_2)_4-CH_3\mathrm{n-Hexane}\]